2 Works

Diurnal timing of nonmigratory movement by birds: the importance of foraging spatial scales

Julie Mallon, Marlee Tucker, Annalea Beard, , Keith Bildstein, Katrin Böhning-Gaese, John Brzorad, Evan Buechley, Javier Bustamante, Carlos Carrapato, José Castillo-Guerrero, Elizabeth Clingham, Mark Desholm, Christopher DeSorbo, Robert Domenech, Hayley Douglas, Olivier Duriez, Peter Enggist, Nina Farwig, Wolfgang Fiedler, Anna Gagliardo, Clara García-Ripollés, Juan Antonio Gil, Morgan Gilmour, Roi Harel … & Bill Fagan
Timing of activity can reveal an organism’s efforts to optimize foraging either by minimizing energy loss through passive movement or by maximizing energetic gain through foraging. Here, we assess whether signals of either of these strategies are detectable in the timing of activity of daily, local movements by birds. We compare the similarities of timing of movement activity among species using six temporal variables: start of activity relative to sunrise, end of activity relative to...

Feather mercury increases with feeding at higher trophic levels in two species of migrant raptors, Merlin (Falco columbarius) and Sharp-shinned Hawk (Accipiter striatus)

Edward Keyel, Matthew Etterson, Gerald Niemi, David Evers, Christopher DeSorbo, Joel Hoffman, John Nichols, Yang Li & Frank Nicoletti
Mercury (Hg) is a toxic heavy metal that, when methylated to form methylmercury (MeHg), bioaccumulates in exposed animals and biomagnifies through food webs. The purpose of this study was to assess Hg concentrations in raptors migrating through the upper Midwestern USA. From 2009-2012, 966 raptors of 11 species were captured at Hawk Ridge, Duluth, MN. Breast feathers were sampled to determine the concentration of total Hg. Mean Hg concentrations ranged from 0.11 – 3.46 μg...

Registration Year

  • 2020
    2

Resource Types

  • Dataset
    2

Affiliations

  • Biodiversity Research Institute
    2
  • Royal Society for the Protection of Birds
    1
  • Senckenberg Biodiversity and Climate Research Centre
    1
  • North Carolina Museum of Natural Sciences
    1
  • University of Minnesota, Duluth
    1
  • Instituto da Conservação da Natureza e das Florestas
    1
  • Philipp University of Marburg
    1
  • Max Planck Institute of Animal Behavior
    1
  • Foreign and Commonwealth Office
    1
  • United States Geological Survey
    1